Tool-grinder



(No Mdel.)

I. H. GIL-MAN.v

x TOOL GRINDER. No. 512,545. y Patented Jan. 9, 1894.

//v vif/Miron A TTOHNEYS.

wAanmaYoN. a. c.

. the tool is ground to the desired shape.

UNITED STATES PATENT EFICE.

IsAAc H. GILMAN, or BELorr, wIsooNs'IN.

TooL-GRINDER.

SPECIFICATION forming part of Letters Patent No. 512,545, dated January9,1894.

` Application tiled June 6, 1893. Serial No. 476,744. (No model.)

.To a/ZZ whom t may concern,.-

Be it known that I, ISAAC I-I. GILMAN, ot' Beloit, in the countyof Rockand State of Wiscousin, have invented a new and Improved Tool-Grinder,of which the following is a full, clear, and exact description.

The object of the invention is to provide a new and improved toolgrinder, which is simple and durable vin construction, very eective 1noperation, and more especially designed to accurately grind drills andsimilar tools to any angle, at the same time giving the desiredclearance.

The invention consists of certain parts and detalls and combinations ofthesame, as will be fully described hereinafter and then pointed out inthe claims. l

Reference is to be had to the accompanying drawings forming a part ofthis specification, 1n which similar letters of' reference indicatecorresponding parts in all the figures.

Figure lis a plan view of the improvement. Fig. 2 is aside elevation ofthe same. Fig. 3 1s a sectional side elevation of part of the same onthe line 3-3 of Fig. 1; and Fig. 4 is a face view of the chuck.

The improved tool grinder is provided with a suitable base plate A, fromthe rear end of which extends sidewise an arm A', in which 1s journaledthe longitudinally extending mainshaft B, carrying at its forward end agrinding wheel C, made of emery or other suitable material, and on theface of which On the other end of the shaft Bis arranged a beveledgrinding wheel C for grinding points of drills when they become thick.On the shaft B is also secured a pulley D connected by a belt withsuitable machinery for im parting a rotary motion to the 4said shaft Band the grinding wheels C and C thereon.

On the top of the bed plate A is formed a suitabletransversely-extending guideway A2, 1n which is fitted to slide theangularly-ar-v ranged bed plate E, by means of a screw F, screwlng 1nthe bed plate E and mounted to turn 1n the bed plate Aas will be readilyunderstoodk by reference to the drawings, the.

front end of the said screw F being provided with the usual hand wheelF', which, when turned, causes the bed plate E to slide transv Versely.v

On thebed plateE is arranged a guideway E at angles to the guideway A2and also at angles to the shaft B, the said guideway being engaged by ablockr litted to slide in the said guideway by means of a screw Hengaging a;nut on the blocksee Fig. 3, and mounted to turn in the bedplate E. On the end of this screw His secured the usual hand wheel Hunder the control of the operator, for adjusting thesaid block G nearerto or farther from the grinding wheel C, as Will be' readily understoodby reference to the drawings.

In the block G are arranged segmental slots G shown by dotted linesFigs. l and 3, engaged by bolts I passing through a base J mounted ontop of the block Gr and adapted to be secured thereon vby the said boltsI. The base J supports, on its top, a cylinderJ standing in alignmentwith the guideway E of the bed plate E, and in which the chuck holder Kis mounted to turn by means of a handle K projecting from the top of theholder through a transversely-extending slot J2 formed in the saidcylinder.

The head K2 of the chuck holder K extends on oneouter end of thecylinder J and is adapted to'receive the shank L of the chuck L of anyapprovedconstruction, the inner face of the chuck fitting against abeveled face of the head K2, the shank L being inclined to the axialline of the cylindrical chuck holder K, as will be readily understood byreference to Fig. 3. In the shank L is i arranged a groove L2 engaged bya set screw N screwing in the head K2 of the holder K to secure thechuck L in position in the holder.

In order to accommodate the tool to be ground, the central aperture ofthe chuck L is in alignment with an aperture K2.' formed augularly inthe chuck holder K and extending through a cap plate O secured on theleft hand end of the cylinder J. On the front face of the chuck L isarranged a finger piece Q, which serves to start all tools at the samepoint and at the proper position relative to the face of the grindingwheel C. This n- IOO in place. By pressing the linger piece outward thedowel is disengaged from its aperture to permit of then swinging thelinger piece to one side (see dotted lines Fig. 4) for introducing orremoving the tool.

In the transversely-extending slot J2of the cylinder .I are held adjustably the stops P to limit the swinging motion of the handle K,according to the desired turn to be given to the chuck L while grindingthe tool held in the chuck.

On the head K2 of the holder K is secured a pointer R adapted toindicate on two sets of giadu'ations L4 formed on the periphery of thechuck L, as is plainly illustrated in Figs. l and 2. A graduation S isalso arranged on the block G to indicate the position of the base Jrelative to the said block. Now, it will be seen that by the arrangementdescribed the base plate E can be adjusted transversely so as to bringthe tool held in the chuck L to any desired point` on the grinding WheelC, and by adjusting the block G carrying the cylinder J, the chuckholder K and and the chuck L, the tool held in the latter can be movedtoward or from the face of the chuck L on the beveled face of the headK2 of the chuck holder K, any desired clearance being given to thecutting edge of the tool, the said clearance being indicated by thepointer R on the graduation L4. It will further be seen that by theoperator being enabled to turn the holder K te the right and left in thecylinder J, a perfect edge is ground on both wings or lips of the toolheld in the chuck. Now, when one lip ot' the drill is ground then theOperator loosens the chuck and a half turn is given to the latter by theoperator moving the handle K. The pointer then indicates on the othergraduation of the set of graduations L4, the exact half turn position.The chuck is then again fastened in place and the other lip of the drillis ground. By this arrangement removal of the drill from the chuck iscompletely avoided until the drill is. finished.

The adjustable stops P are used to gage the amount ground off the drill,as some drills are worn more than others and hence the stop is moved toproper position and left in this position until both lips of the drillare ground. By this arrangement the same amount of material is ground 0Eon both lips of the drill.

When the finger piece Q is in properpos'ition as shown in full lines inFig. 4.-, the drill is moved up to it until the lip restson a shoulderformed on the central prong of the finger piece as illustrated in Fig.3, the shoulder serving as starting point for lthe drill.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patent- 1. In a tool grinder of the classhei'einbefore specified, the combination, with a chuckholder having abeveled face and a bore in clined to its axis, of a chuck, ortool-holder, whose shank is arranged in such bore as and for the purposespecified. y

2. In a tool-grinder of the class hcrei'nbefore described, thecombination, With the chuck, L, of the spring finger-piece, Q, pivotedto the face of said chuck and provided with a dowel adapted to enter arecess in the chuck, whereby the linger-piece serves as a stop for thelip of a drill and may be removed out of thel way during the grinding,as shown and described.

3. In a tool grinder of the class hereinbefore described, thecombination, with the chuck holder, K, having the angular bore and'abeveled face, of the chuck, L, fitted in said bore and against saidface, and provided with graduations on its periphery, a pointer fixed onsaid chuck-holder adjacent to the graduations, and a handle, attached tothe chuckholder, for rotating it and reversing the drill, as specified.

ISAAC I-I. GILMAN.

Witnesses:

ARTHUR H. Goss, CHARLES H. PRATT. r

